221097597 has 32 divisors (see below), whose sum is σ = 372252672. Its totient is φ = 113735424.

The previous prime is 221097593. The next prime is 221097599. The reversal of 221097597 is 795790122.

It is not a de Polignac number, because 221097597 - 2² = 221097593 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221097593) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5253 + ... + 21674.

It is an arithmetic number, because the mean of its divisors is an integer number (11632896).

Almost surely, 2^221097597 is an apocalyptic number.

It is an amenable number.

221097597 is a deficient number, since it is larger than the sum of its proper divisors (151155075).

221097597 is a wasteful number, since it uses less digits than its factorization.

221097597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26977.

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 221097597 is about 14869.3509273270. The cubic root of 221097597 is about 604.6833458935.

The spelling of 221097597 in words is "two hundred twenty-one million, ninety-seven thousand, five hundred ninety-seven".